//
//  NSString+XDIsEmpty.m
//  DAU-iOS
//
//  Created by XiangDongMBP on 2016/11/19.
//  Copyright © 2016年 East. All rights reserved.
//

#import "NSString+XDIsEmpty.h"

@implementation NSString (XDIsEmpty)

//判断内容是否全部为空格  yes 全部为空格  no 不是
+ (BOOL)xd_isEmpty:(NSString *)str {
    
    if (!str) {
        return true;
    } else {
        //A character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085).
        NSCharacterSet *set = [NSCharacterSet whitespaceAndNewlineCharacterSet];
        
        //Returns a new string made by removing from both ends of the receiver characters contained in a given character set.
        NSString *trimedString = [str stringByTrimmingCharactersInSet:set];
        
        if ([trimedString length] == 0) {
            return true;
        } else {
            return false;
        }
    }
}

- (NSString *)xd_trim {
    return [self stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
}

- (NSString *)xd_clearAllWhitespace {
    return [self stringByReplacingOccurrencesOfString:@" " withString:@""];
}

@end
